Precursor symptoms of pellagra (mange) do not include fatigue. According to the query related to public information: the precursor symptoms of pellagra are: poor memory, weight loss, hair loss, and loss of appetite. Niacin deficiency, also known as pellagra, is due to a deficiency of niacin-like vitamins, clinically characterized by dermatitis, lingual inflammation, enteritis, mental abnormalities and peripheral neuritis.